Είναι το Longines Lindbergh Hour Angle Watch, που σχεδιάστηκε από την εταιρεία με την συνεργασία του πιλότου υπερατλαντικών πτήσεων Charles Lindbergh. Το ρολόι με τις ενδείξεις της περιστρεφόμενης
στεφάνης και του περιστρεφόμενου εσωτερικού δίσκου, βοηθούσε στην πλοήγηση, υπολογίζοντας το γεωγραφικό μήκος με βάση την ώρα Γκρίνουιτς. Τώρα πως ακριβώς το κάνει... 
The Longines Lindbergh Hour Angle is an aviation navigation tool developed with Charles Lindbergh after his 1927 transatlantic flight. It works by converting
the watch's time display into degrees of longitude (the hour angle), allowing a pilot to determine their exact geographical location when used alongside a sextant and a nautical almanac.The Dial & Bezel BreakdownUnderstanding the watch requires familiarizing yourself with how time equates to Earth's rotation:
The Hour Hand: The Earth rotates 360° in 24 hours, meaning every hour represents 15° (360 ÷ 24 = 15). The hour hand tracks these 15° intervals on the dial, doing a half-turn over 12 hours (representing 180°).
The Minute Hand: Because an hour is equal to 15°, the minute hand tracks precise increments. Every 4 minutes, the minute hand passes 1°.
The Seconds Hand: A full rotation of the sweeping seconds hand equals 15°. You can read precise fractions (quarter-degrees) on the dial.
The Rotating Bezel: Used to account for the equation of time—the minor discrepancy between standardized, mechanical time and "true solar time" (which fluctuates daily based on the Earth's elliptical orbit around the sun).
Step-by-Step: How to Calculate Longitude
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Λόγω όλων αυτών των .............δυσκολιών, βγάλανε το .......GPS
